Pontic for bridgework



NOV. 18, 1930. Q l FlsCHLER 1,781,899

PONTIC FOR BRIDGEWORK Filed Dec. 17 1924 WITNESSES /i i lxvENToR 720 ATTORNEYS vPatented Nov. 18, 1930 UNITED] sTafl?its` To .THE COLUMBUS DENTAL ix'rANUisn'eorUmNCf oo.`,` for COLUMBUS, OHIO, n,oomciaaL TION I 1:eoN'rIC non: Balnsnwonx Application nled'necember 17,@192'4. l.Usern-i1 y'No.75a57111'Y Q My invention relatesto bridgeworkv and more particularlyv to a bridgeworl for 'the bicuspids and -molars v The general objectv of myinvention` isA to' provide pontics of bridgework of a character that .the porcelain or rootjof bicuspid. orl molar may be replaced withoutqdisturbmg the position of thebridgework in the mouth, sov that the occlusal attachment" or casting of the pontic, either bi'cuspid ormolar, and the connection of the sairiewvith the abutments ofthe bridgework remain undisturbed, whereby to make' provision for the replacing of the porcelain tooth-root of a pontic for the purpose of making the toothroot or porcelain portion interchangeable, thus permitting substitution of a-tooth-root of different c size to suit changing conditionsofthe gum.`

A porcelain. tooth-root of a pontic is often referred toV in practical dentistry as the porcelain tooth-root facing but will hereinafter Y be referred to as the porcelain portion or root of the pontic in-distinguishing itV from the casting or occlusal attachment;

The nature of my invention and its distinguishing features and advantages will clearf ly appear as the ldescription proceeds.

Reference is to be had to the accompanying drawings forming a part of this specification, it being understood that the drawings aref merely illustrative of vpractical examples of the invention. Y

Figure lis :a front velevation of upper teeth having a bridge therein the root of one of the pontics being omitted to clearly show the form of the casting at a pontic; Y

Figure 2 is a vertical section through the gum and pontic in a plane indicated bythe line 2--2, Figure 1; a

Figure 3 is a perspective View of the root orporcelain portion of the pontic; i

' Figure 4 is a perspective viewof the ing ofthe pontic; Y j c Figure 5'is aside elevation of a bicuspid illustrating i a' pontic of slightly modified Figure 6is a rear elevation or elevation at the lingual surface of the pontic shown in Figure 5;

further modified.;

BERNARD FISCHLER, or BROOKLYN, NEW Yoan, AssICNQOR', BYMESN AssrGNMENrs,

Y Figure 7 vis 'a fverticalsection of yFigure V8 -isfarear elevationoftliejpontic shown in Figure 7.

Y `In the illustrated: example of my linvention the vletter a indicates a'portion of the upperV gum Z ,`a molar to whichv the'bridge is at-'I bicuspid to `which thebridgef tached;V and c the is attached.v n

In carrying out my` invention the bridge in-ff cludes the usualabutment casting 10 applied"v to the molar b andllV indicates theabutment casting appliedl'to thebicuspid '0. The man@ nerrof securing the abutment castings 10 and 11 may be in accordance with any approved a method as the abutme'nts 10, 11of the bridgeV form no part of my invention which relates to the .pontics, that isxto say, thatbicuspid and molarlbetween the'molar b and bicuspid c."

Y VThe pontics in accordancewithmy 'invention include the root or porcelain 12'of the gvv molar pontic and the casting, cap or'occl'usal i attachmentY 13 of the :molar pontic.` The numeral 14 indicates the occlusal attachment kor Ycastingfortheroot ori porcelain 15 ofthe bicuspidof the pontic of thebridgeworkff `The:occlusal*attachments` 13 and 14 aref substantially the same v except as the shape varies to con-,form to the molar root'12 or i bicuspid rootil, so that the same reference' characters Willapply to the distinctive fe'a-v f tures vin-each attachment 13'fand 14. 'The molar root -12'andlthe bi'cuspid'rrootl-are i Vformed at themorsalend of eachroot with cut-outs or entrant surfaces :at oppositesides to form adovetail lextending from the-V lingualxside of the root forwardly and terminating sho'rtofthe facial side of theroot.-

VEach sideil'A fof' the cut-outof a pontic root I L inclined to 'form the side of the dovetail 16.

The adjacent side 18 ofthe cutL-outyhowever,

in they form shown in `Figures 1 Vto 4 is formed Ito present a flat incline.. The formation of the `side cut-,outsleaves the lmorsal end 19 of i the root of reduced Width,` said surface 19 being the `morsalr'surface of the' dovetail 16.Y Y

The morsal surface 19 oftheroot 15 is opposed to the gingival surfaces 2O of the occlusal attachments 13,14, which, it will be observed-particularly from Figure n2 vextend obliquely and in a latfplane which declines from the lingual side or back of the'occlusal attachment to the facial edge 21 of the attachment, said facialedge being formed by the convergent gingival surface 19 of the attachfaceis-varied by the form ofthe cusps orprotuberant members 22` on the morsal surfaces for masticating. The numeral 23.A indicates the side members on the occlusal attachments' 13, 14, said side membersinating the dovetail side-surfaces 17 and adj acent (surfaces 18 V.of the cut-outs or entrant recesses lproduced iiifonmingthedovetail 16. It will be seen that the slope of the opposed surfaces 19, 2.01-is downwardly and .forwardly 4from theflingual sidefor back ofthe pontics- Hence,las will kbe particularlyclear from Figure 2, the lroot 12 or the root 15-may bereplaced'by one of different size Without disturbing the attachments 13,14, itbeing understood that said attachments 13,14, are as usual soldered to-each other-and to theabutments 10, 11. Thus, the occlusal -attachment 13 or 14 presents in a generallyhorizontalplane the morsal'surface ofthe pontic and at the sametimesaidsurface presentsat ythe gingival side a slope cor.- responding with .the similar slope v4of the root 12-or 15, so disposedasto permit the sliding ofthe Yroot 12-or` 15 intoplace from the front rearwardly. .Vhen the .roOtis in place on the occlusal attachment, it is held firmly by reason of the dovetailor-undercutrecesses in the lroot and the corresponding members 23of-the occlusal attachment. f f

It will be seen-thatl the Vside-flanges 23 bwhich perta-intc the form of occlusal Vattachment shown ;in Figures 1 t0 4 presents lan opening Y 241at the -lingual sidefthat is to say, theocclusalattachment is-open atithe back .or lin- L gual-iside.

In the formshown in Figures and, the

occlusal attachment' 1^14-corresponds in allk respects :with the attachment l4exceptzthat theupperedges 25 of the side members, 123, which correspond with the members-23, present a curved gingival line kinstead `of a straight line 26, which straight line 26vcon- Y forms to fthe straight line or flat morsal'surfaee-18 ofthe pontic root. .The moi'sal surface 118 of root'115 is-curved to correspond with the fgingival surface 25 ofthe members 123.k The'numeral 116 'indicates thedovetail of root 115 corresponding with similar dove- Vtail 16 `in Figures 1 to In Figures 7 and 8 the numeral 215 'indi- Cates a bicuspid root corresponding with the i'oots 15 and 115 and the Vnumeral 214 .indi- Cates the occlusal attachment thereof.` The root 215v presents a curved-surface 218 cor responding withcurved surface118. The at- .root215 is undercut to correspond with the `flanges Y223.

rlfhe gingival surface 220,.,in Figures 7 Vand Sand the, 1n01valsurface120 g e in" 4 igui'es 5 and 6 arein an oblique plane as are the lopposed surfaces 19, 20 in Figures 1 kto 4. v'nfall'forma therefore, the said fiat oblique surfaces l,are produced presenting an` 16 and conforming tothe inwardly directed I would state in conclusionithat while the illustrated examples constitute practical examples-.of my invention, I do notlimitmyself strictly to the exact detailsherein.illustratech since, manifestly, the. same can beY considerably varied -without departure from the spirit of the invention as delined in-.the appended claims.

Having :thus described my invention,` 1-

. v 95 1.*An artificia'letoothhaving kan integrali cl aim z.

root, anda flat oblique occlusally l,disposed end extending fromlthelingu'al Ito the labial f face, and having undercut side walls, v4the undercutsv increasing in depth toward'the lingual face, a recess in the :lingual faceof the tooth intercepting said undercuts at their lingual end. i

2. An artilicial tooth having an integral root,l and a flat `oblique occlusally disposed end extending from the lingual to the labialA face, and having undercut side Walls, the undercuts Iincreasing in depth'toward the lingual face,a recess in the lingua-l face of the tooth interceptinggvsaid undercuts at their lin` gual end, and an occlusal attachment having undercut side flanges designed toengagetlie undercutwalls of the tooth, and aflange at the lingual .end of the iianges Adesigned. to'

engage the said 4recess in the lingual face of thetooth. f A

8. An artificial tooth having 4an integral root, a recess in its lingual face and Aaflat oblique occlusally disposed end extending frein the lingualto the labialface, andhaving undercut side walls, the undercuts increasing inl depth toward the lingual face, and .an occlusal attachment having undercut side flanges designed to engage `the undercut walls of the tooth, anda flange at the lingualend of the lflangesl designed to engage the'said recess in the lingual face of the tooth.

' BERNARB FISCHLER.

izo

' iso 

